Donut Load Cell


Applied Measurements CCG low profile donut load cell (also known as an annular load cell, force washer or load washer) has been designed for applications where bolt tension needs to be measured with a very low-profile transducer.  They are also used in cable tension measurement applications where they are mounted at the anchor point to provide continuous monitoring.

The annular donut load cell design is inherently stiff which gives it an excellent frequency response allowing it to be used for transient measurements if required, while its rugged stainless steel construction and IP66 ingress protection rating ensure a long and maintenance-free life.

Our annular donut load cell design is one that customised regularly to suit a multitude of applications, these include even lower height versions, the current record for which stands at 5mm, fully submersible IP68 versions and versions with inserts to allow the use of a single load cell with multiple sizes of bolt.  We have also constructed very high capacity versions, with 3000kN / 300 tonnes being the largest manufactured to date, however, it is possible for us to manufacture versions rated to 15MN / 1500 tonnes and above for extreme applications.

Additionally, if you can allow the space for a taller load cell, the accuracy can be vastly improved by doubling the standard height.  So, if you need a special version to suit your application please call your Applied Measurements expert technical team who will be happy to discuss your required specification in detail, or use our contact form in the sidebar.

Product Dimensions

CCG Annular Donut Load Cell Outline Drawing
ModelCapacity (kN)ØAØBØCHDeflectionResonant Frequency (kHz) @ Zero LoadWeight (kg)

All dimensions are in mm

Wiring Details

Red+ve excitation
Blue-ve excitation
Green+ve signal
Yellow-ve signal
ScreenTo ground – not connected to load cell body


  • Capacities: 0-12.5kN up to 0-540kN
  • Output: 1.5mV/V nominal
  • Environmental Protection: IP66
  • Accuracy: <±1.5%/RC typical
  • Custom-Sized Versions Available


Rated Capacity (RC)kN0-12.5, 0-25, 0-35, 0-50, 0-100, 0-160, 0-200, 0-250, 0-300, 0-360, 0-540
Operating ModesCompression Only
Sensitivity RangemV/V1.5mV/V nominal (see note below)
Zero Balance/Offset±%/Rated Output<5
Non-Linearity±%/Rated Output<1.5 typical / 5 worst-case
Hysteresis±%/Rated Output<1.5 typical / 5 worst-case
Repeatability±%/Rated Output<±1% for identical mounting position, <±10% for altered mounting position (see note below)
Temperature Effect on Zero±%/Rated Output/˚C<0.030
Temperature Effect on Sensitivity±%/Rated Output/˚C<0.030
Input ResistanceOhms (nominal)375 (750 for capacities above 40kN)
Output ResistanceOhms (nominal)350 (700 for capacities above 40kN)
Insulation ResistanceMegohms>5000 @ 50Vdc
Excitation VoltageVolts AC or DC10 recommended (2-15 acceptable)
Operating Temperature Range˚C-20 to +70
Compensated Temperature Range˚C+10 to +60
Storage Temperature Range˚C-20 to +70
Safe Overload% of Rated Capacity150
Ultimate Overload% of Rated Capacity300
Deflection @ Rated CapacitySee dimension table
Fundamental Resonant Frequency*See dimension table
IP Rating (Environmental Protection)IP66
Weight (excluding cable)See dimension table
Fatigue Life108 cycles typical (109 cycles on fatigue-rated version)
Cable Length (as standard)metres2
Cable Type4 core + screen, PVC sheath via cable gland
Construction MaterialStainless Steel
Max Resolution1 part in 250,000 (with appropriate instrumentation)
*The resonant frequency is calculated with the body of the load cell attached to a large plate, ensuring that only the sensing element oscillates: This is vital to achieve the highest natural frequency and subsequent frequency response.
Note: The sensitivity range stated above is dependent on the selected mounting position. If the mounting position is maintained during operation, then the CCG will be repeatable and linear within the parameters specified above. If the mounting position is altered, then the sensitivity range may change by up to ±10%, as may repeatability.


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